And it may be helping drive interest in London property. Overall, sales of £10 million-plus properties jumped by a third this year, compared to the same period in 2013.

Real estate in the U.K. capital attracts strong international investment and geopolitical instability in other parts of the world is expected to continue driving demand.

There has also been a jump in Chinese buyers moving into the London market. China accounted for 3% of sales after negligible demand in previous years. Rather than investment properties or flats, Wright said Chinese buyers are instead searching for houses.

"These are buyers who clearly intend to spend time living in London with their families," Wright said.